Welding transformer



Nov. 26, 1940. E. BECKER E'rAL 2,223,054

WELDING TRANSFORMER Filed Feb. 14, 1939 mas. WEN I W W M By ArmR/VEK Patented Nov, 26, 1940 UNITED STATES w 2,z23,o54 wnLDrNG 'rnANsronMEa `Emil Becker, Munich, Germany, and John Edward Becker, Stoney Creek, Ontario, Canada Application February 14, 1939, Serial No. 256,298 In Germany February 21, 1938.

2 Claims.

Our invention relates to improvements in welding transformersand the object of the invention is to produce a comparatively' light manually movable welding appara'tus which is self-contained and so constructed that it, can be employed to fit within comparatively small' hollow structures wherein the welding is accomplished from the inside of the structure, the complete welding apparatus being moved from welding-pointto 10 welding-point along the inside of the structure.

A further object of our invention is, to construct our Atransformer particularlyl for two-point welding and to furish manually operable means for elevating or lowering the welding electrodes 15 into and out of contact with the work being welded, the electrode moving rod or handle being to wind the primary winding upon oneportion of t 30 the core and the secondary winding upon another portion of the core so that the windings do not overlap. In this way the height of the transformer is kept at a minimum.

' Our welding transformer is preferably carried 35 upon a plurality of rollers distributed along its bottom face soAthat the transformer can be readily rolled into the inside of and along the cells of cellular structures, the transformer being guided in its movement by the elongated elec-- 40 trode actuating handle which is designed of sufficient length to protrude outwardly from any average structure being weided. i

For an understanding of the invention and the manner in which'the same is constructed and op- 45 erated, reference is to be had to the following description and the accompanying drawing, in which: I w

Figure 1 isea cross-sectional view| through a transformer constructed in accordance with this V50 invention and a hollow cellular structure which is being welded from 4the inside.

Flgure 2 is a planV` view of'the transformer constructed in acc'ordance with this invention, and Figure 3 is a cross-sectional viewV on the line '55 3-3, Fr'igure 2.

Like characters of reference refer to like parts throughout the specification and drawing.

Our transformer broadly comprises a magnetic core I which follows standard practicedn being constructed of laminated form, as indicatedby 5 the laminae 20 in Figure 3. The laminated core I is of rectangular form and of a comparatively small height in relation to its length and breadth, as will be apparent from the drawing, and is formed with three longitudinal slots 3, 4 and 5 which pass downwardly through the core and extend from the vicinity of one end of the core to the other. i.

The core I carries the primary and secondary windings 6 and 8 which pass through the slots 4 and 5 around the central portion of the core, as illustrated in Figures 2 and 3. The windings 8 and 8 are positioned upon the core I so that they do not overlap, that is, the primary winding 6 is wound upon one end portion of the core and the winding 8 wound around the other end portion of the core. In this way the height of the transformer is kept at a minimum. The windings G and 8 are, of course, distinct from one another following standard practice and the primary winding 6 is connected `.by a cable 'l to a source of electric power. The secondary winding 8 is furnished with short secondary cables 9 and III connecting the secondary winding to the welding electrodes II and I2. i The welding electrodes II and I! are suitably v mounted upon an adjustable frame I3 which is in turn carried upon a truck element IS secured .to the forward end of the transformer unit. The

transformer and the truck IS are furnished withl a plurality of supporting rollers I`I whereby the assembly can be conveniently wheeled into a structure to be welded. VIf it is desirable, the upper face of the transformer assembly can be furnished with a plurality of 'rollers IG which are 4 0 provided to engage the top of' astructure into which the transformer'may be'inserted. The frame Il is adiustably mounted 'upon the truck IS through the provislon of a suitable eccentric mechanism Il. The rotation of-the eccentric mechanism Il causes therelectrode supporting frame Ilto be raised or lowered so'as to bring the electrodes intofand out o f contact with the structure being welded.

The eccentric mechanisrn Il .can be of any simple and suitable design and .it is preferably actuated by a long handle spindle Il havingV a w handle I! upon its outer end, the spindle being connected at the other end to the eccentric mechanism I l and upon twisting of the handie, moveof ment of the frame |3l and electrodes is achieved. w The handle spindle |8 is preferably made of sufilcient length so that its handle |9 will protrude outside of any normal sized structure into which our transformer is being inserted. The handle spindle |8 has a dual function in that the operator can move the transformer into place in the structure by pulling or pushing on the handle spindle |8,-and upon twisting the handle IS, the electrodes Hand 12 are brought into and out of contact with the structure being welded. The

spndle |8 extends through the central cell 3 in the core I and also through the end portions of the core at the ends of the cell 3, as illustrated 'in dotted lines in Figure 2.

From the foregoing description it will be seen thatwe have devised a welding transformer which is of a relatively small height and therefore particularly adapted for use in insertion into small cellular structures, and that adjustment v through the slots and around'one end portion of the core and connected to a source of electrical current, a secondary winding wound through the slots and around the other end portion of' lthe core, the primary and secondary windings beingr positioned side by side, a pair of welding electrodes adjustably postioned at one end of the core and connected to (the secondary winding, rollers upon whichthe transformer is mounted, and means extending from the transformer for actuating the electrodes independently of movement of the transformer. t

2. A welding transformer incorporating a horizontally positioned elongated bar core having a pair of Vertical slots extending through its top and bottom faces, a primary Winding wound through the slots and around one end portion of the core and connected to a source of electrical current, a secondary winding wound through the slots and around the other end portion of the core, the primary and secondary windings'being positioned side by side, a pair of welding electrodes adjustably positioned at one end of the core and connected to the secondary winding, rollers upon which the transformer is mounted, and a manually twistable spindle extending from the transformer to constitute a guiding handle for wheeling the transformer and alsorfor actu'- atingrthe electrodes independntly of movement :o

of the transformer.

EMIL BECKER. JOHN EDWARD BECKER. 

